This works as expected with the first file (listed below) but it doesnt work with the second file. There is no error when I try with the second file, rather is creates an unusually large file that would not open:

The complete console outputs for each command are missing. These are more useful than simply stating that it "doesn't work". Also, ffmpeg command line usage questions are off topic here. Stack Overflow is limited to programming questions and Super User is a better place to ask this. Your message can be migrated to prevent cross-posting and duplicates.
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LordNeckbeardFeb 15 '13 at 21:05